Provide a setup script for MercuryDPM

Author: davidscn

channel-transport-particles/particles-mercurydpm/setup-mercurydpm.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# ---- Config (you can override via env vars) ----
+REPO_HTTPS_DEFAULT="https://bitbucket.org/davidscn/mercurydpm.git"
+REPO_URL="${REPO_URL:-$REPO_HTTPS_DEFAULT}"          # or git@bitbucket.org:davidscn/mercurydpm.git
+BRANCH="${BRANCH:-channel-transport-tutorial}"
+SRC_DIR="${SRC_DIR:-$PWD/mercurydpm}"
+BUILD_DIR="${BUILD_DIR:-$SRC_DIR/build}"
+
+# ---- Clone (if needed) and checkout branch ----
+if [[ ! -d "$SRC_DIR/.git" ]]; then
+  echo "Cloning repo into: $SRC_DIR"
+  git clone "$REPO_URL" "$SRC_DIR"
+else
+  echo "Repo already exists at: $SRC_DIR"
+fi
+
+cd "$SRC_DIR"
+git fetch --all --prune
+git checkout "$BRANCH"
+git pull --ff-only || true
+
+# ---- Configure with CMake in build directory ----
+mkdir -p "$BUILD_DIR"
+cd "$BUILD_DIR"
+
+echo "Configuring in: $BUILD_DIR"
+cmake -D MercuryDPM_PreCICE_COUPLING="ON" ..
+
+# ---- Build only the requested target ----
+echo "Building target: ChannelTransport"
+make -j "$(nproc)" ChannelTransport
+
+export MERCURYDPM_BUILD_DIR="$BUILD_DIR"
+echo "Exported MERCURYDPM_BUILD_DIR=$MERCURYDPM_BUILD_DIR"
+echo "Done."
+